TRENTON — The sweeping New Jersey corruption case that ensnared 46 people is now down to just three — and one of those hasn’t been seen in three years.

Tuesday, David Goldhirsh, 30, of Brooklyn, pleaded guilty in federal court in Trenton to helping launder money through a religious charity for government informant Solomon Dwek.

According to documents filed in the case, Goldhirsh served as a cash courier, using charities to help launder checks from Dwek, in exchange for a 10 percent fee. He faces up to five years in prison and a $250,000 fine when he is sentenced on Oct. 24.

Dwek, a failed Monmouth County real estate investor, wore a wire to set up dozens of people in the biggest undercover sting in New Jersey history. Of those charged, 32 pleaded guilty and four were convicted. Two were acquitted, one died, and charges were dropped against four.

Of those left, two are also seeking dismissal of the charges against them, and one fled after the arrests became public in July 2009.